Minimum Detectable Flux Calculator

The following calculator returns the minimum flux of neutrons (or any other radiation of interest), incident on a detector with the specified characteristics, that can be detected in a given measurement time. The false negative probability is fixed and set to 0.01, i.e., if a source is present it will be detected 99% of the time. The false alarm probability (FAP) can be selected among three different values. For instance, a FAP of 0.0001 means that if 10,000 measurements are taken, only 1 will result in a false alarm.